Verfahren zum Wiedergewinnen von Radiojod beim Wiederaufbereitungsverfahren für verbrauchten Kernbrennstoff.

摘要

Off-gas (3) generated when spent fuel (1) containing radioactive iodine is subjected to shearing and dissolving treatments (2) is scrubbed (4, 5) and, when necessary, subjected to a precipitation treatment (8) by addition of additives, after which waste liquid containing radioactive iodine is freeze-dried (9) by a freeze vacuum drying process to recover radioactive iodine as iodine compounds (10, 11). Since the radioactive iodine does not vaporize, release of the radioactive iodine into the environment can be eliminated; also, consumption of a collecting agent such as silver zeolite for collecting vaporized radioactive iodine can be reduced. The iodine compounds containing the recovered radioactive iodine are given the same composition as a stable, naturally occurring mineral and solidified and mineralized (13, 14) as by a high-pressure press. This makes it possible to store long half-life <1><2><9>I radioactive iodine safely for an extended period by sealing recovered radioactive iodine in a stable mineral.